Cornelius callahan



(No Model.) 2 Sheets-Sheet 1 O. GALLAHAN.

RELIEF VALVE.

No. 445,041. Patented Jan. 20, 1891.

(No Modell) 2 Sheets-Sheet 2.

O. OALLAHAN.

RELIEF VALVE.

No. 445,041. Patented Jan. 20,1891.

STATES PATENT OFFICE.

CORNELIUS CALLAHAN, OF BOSTON, MASSACIIUSETS, ASSIGNOR TO THE CORNELIUSCALLAHAN COMPANY, OF SAME PLACE.

RELIEF-VALVE.

SPECTFICATION forming part of Letters Patent No. 445,041, dated January20, 1891.

Application filed October 9, 1890.

T0 ctZZ whom it may concern:

Be it known that I, CORNELIUS UALLAHAN, of Boston,in the county ofSulfolk and State of Massachusetts, have invented certain new and usefulImprovements in Relief-Valves for Gravity or Increased \Vaterlrcssu re,of which the following is a specification.

My invention relates to relief-valves for gravity or increased waterpressurethat is, to devices contrived to relieve the apparatus and hoseof the back action of the water or pressure of the water above apredetermined degree.

It is the object of the invention to provide a relief-valve which shallbe simple in construction, certain in its operation, and thoroughlyefficient for the purposes for which it is intended.

The invention consists of the improvements in relief-Valves which I willnow proceed to describe and claim, reference being had to the annexeddrawings, and to the letters of reference marked thereon, forming a partof this specification, the same letters designating the same parts orfeatures, as the case may be, wherever they occur.

Of the aforesaid drawings, Figure 1 is a perspective view of arelief-valve casing equipped with my improvements. Fig. 2 is a verticalcentral sectional view thereof. Fig. 3 is a transverse verticalsectional view.

In the drawings, a designates a valve-casin g adapted to be attached toa pump or hydrant, and constructed, as at b, so as that a hose may becoupled thereto, 0 designating an exit-port, through which the watermaybe led to a section of hose and conveyed back to the pump or bedischarged upon the ground.

(Z designates a valve secured to the lower end of the valve-stem e, andheld normally on its seat f to close the port 0 by means of a spring g,operating at its upper end against the lower face of the valve 72,secured to the upper end of the Valve-stem and at its lower endon thebottom of the valve-chamber i.

jj designate ports leading from the chamher it of the valve-casin g tothe valve-chamber i, so that water may he admitted to said chamber iaudoperate against the valve h, the face of which is of greater area thanthe face of valve d, so as to overbalance the latter and Serial No.367,521. (No model.)

insure the retention of the valved against its seatf, and thus keep theoutlet-port 0 closed.

Z designates a chamber formed in a projecting part on of thevalve-casing a, in which chamber is arranged a valven, adapted to bepressed against its seat 0 by means of a spring 19, which operatesagainst the rear face or end of the valve 71.

r designates a port leading from the valvechamber 1 down to a pointbelowthe valved, so that if the valve 17. should be drawn back from its seat0, as represented in Fig. 2, the

waterin the chamber 1' might flow through the port 0* and be dischargedthrough the port 0.

The annular enlargement m on the valvecasing is screw-threaded on itsexterior, as represented at s, and a screw-cap t, constructed so that itmay be turned upon the enlargementor stem or, and thus regulate thedegree of tension with which spring 1) may bear against valve n to holdthe same upon its seat 0.

a is a set-nut screwed upon the annular stein m, and adapted to beturned up against the inner end of the screwcap s after the latter hasbeen so adjusted as to cause the spring 17 to bear with the requisitestress upon the valve 11, as before explained.

The operation of my improvement is as follows: Supposing that it isdesired that the pressure of the water upon the hose or apparatus shouldnot exceed one hundred poundsto the square inch, the screw-cap 6 will beturned up against the springp to an extent that a fraction of pressureabove one hundred pounds to the square inch would overcome the stress ortension of the spring and force the valve it back from its seat. Withthis adjustment of the parts the valves (1 and 7t will assume thepositions in which they are represented in Fig. 3, water passing up intothe chamber 1' and operating against the face of the valve h withgreater force than it operates against the face of the valve (Z. Shouldthe apparatus be in operation and the Water shut off from the nozzle ofthe hose or from any other reason the pressure of the water should tendto exceed one hundred pounds to the square inch, this undue forceoperating against the valve 92 will force the same back from its seatagainst the stress of spring p, opening the port 1", and releasing thewater in the cham her 6, as shown in Fig. 2,so thatinstantly the.pressure of the water upon valve (Z will become much greater than uponthe vali e Zz. As a consequence, the latter valve will be forced downfrom its seat, as represented in Fig. 2, opening the port 0 and allowingthe water to How or be forced out therethrough. The instant the pressureof Water in the apparatus falls below one hundred pounds to the squareinch the spring 19 will operate to force valve at back upon its seat 0,and the pressure of water in chamber 11, operating against valve h, willraise the same and with it valve (Z,- and so close the port 0, asrepresented in Fig. 25.

The ready manner in which the spring 2) maybe adjusted so as to bearwith greater or less force upon the valve n is an important feature ofthe invention.

The valve (Z is supported somewhat loosely on the lower end of thevalve-stem e, and the hole formed through the said valve is packed by aheaded screw 'v, tapped into the lower end of the valve and clamping awasher w between. the head of the screw and the-sur- 1. A relief-valvefor gravity and increased water pressure, consisting of the valve-casingprovided with an outlet-port c and valvechamber 2', a valve h in saidchamber, ports j j, leading from the casing-chamber to thevalve-chamhert',a valve (Z- to close the outletport 0, avalve-stemconnecting the two valves (Z 71, the face of the valve h being ofgreater area than the face of the valve (Z, the valvechamber Z, thespring-pressed valve 12 to close the port leading from the valve-chamberi to the valvechamber Z, and a port or passage 1, communicating betweenthe valve-chamberl and the outlet-port c, as set forth.

2. A relief-valve for gravity and increased water pressure, consistingof the casing a, provided with the outlet-port c and valvechamber 2', avalve h in said valve-chamber, portsjj, leading from the interior of theeasing to the valve-chamber '2 a valve to close the outlet-port, avalve-stem connecting the two valves (Z and h,the face of the lattervalve being of greater area than the face of valve (Z. the valve-chamberZ, the valve n to close the port leading from the valve-chamber t to thevalvechamber Z, a spring to press the valve n upon its seat, a screw-capfor ad j usting the tension with which the said spring may bear upon thevalve 1t, and a port 4", leading from the chamber Z to the outlet-portc, as set forth.

In testimony whereof I have signed'my name to this specification, in thepresence of two subscribing witnesses, this 30th day of September, A. D.1890.

CORNELIUS CALLAHAN.

Witnesses ARTHUR WV. ORossLnY, A. D. HARRISON.

